package org.apache.maven.configuration;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import java.io.File;

/**
 * A path translator that resolves relative paths against a specific base directory.
 * 
 * @author Benjamin Bentmann
 */
public class BasedirBeanConfigurationPathTranslator implements BeanConfigurationPathTranslator {

  private final File basedir;

  /**
   * Creates a new path translator using the specified base directory.
   * 
   * @param basedir The base directory to resolve relative paths against, may be {@code null} to
   *        disable path translation.
   */
  public BasedirBeanConfigurationPathTranslator(File basedir) {
    this.basedir = basedir;
  }

  public File translatePath(File path) {
    File result = path;

    if (path != null && basedir != null) {
      if (path.isAbsolute()) {
        // path is already absolute, we're done
      } else if (path.getPath().startsWith(File.separator)) {
        // drive-relative Windows path, don't align with base dir but with drive root
        result = path.getAbsoluteFile();
      } else {
        // an ordinary relative path, align with base dir
        result = new File(new File(basedir, path.getPath()).toURI().normalize()).getAbsoluteFile();
      }
    }

    return result;
  }

}
